Stars with a mass of about 0.5 to 8 solar masses evolve differently than other mass ranges because ____
a. their interior structure is controlled by radiative energy transport
b. they will never reach the temperature needed to ignite carbon fusion
c. their interior structure is controlled by convective energy transport
d. they have strong stellar winds throughout their main-sequence lifetimes
e. they will never reach the temperature required to establish a helium-fusion shell
b
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Which of the following best describes the meaning of declination and right ascension?
A) They are coordinates on the celestial sphere that are very similar to the coordinates of altitude and direction on Earth. B) They are used to describe the locations and distances of stars that we see in the night sky. C) They are coordinates on the celestial sphere, with declination telling us the angular distance of an object from the celestial equator and right ascension telling us how far around the celestial sphere an object is located from the vernal equinox. D) They are terms used by astronomers to describe how the sky changes with the seasons.
Atoms of which group of elements have seven electrons in the outer shell?
a. Noble gases b. Alkali metals c. Alkaline earth metals d. Halogens
A child throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. The ball leaves her hand 1.00 m above the ground. At what angle below the horizontal does the ball approach the ground?
A) 35.1° B) 38.6° C) 48.0° D) 40.0° E) 65.2°
Novae are more closely related to type II than to type I supernovae
Indicate whether the statement is true or false